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Taking a fish oil capsule daily during pregnancy and the first few months of breastfeeding can reduce your baby’s risk of egg allergy by 30%, a new study has found.

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Researchers from the department of medicine at Imperial College London say that omega-3, a polyunsaturated fatty acid found in fish oil, has positive, anti-inflammatory effects.

According to a 2014 study, the lifetime self-reported prevalence of common food allergies in Europe ranged from 0.1 to 6.0%. In the UK, one in 20 children suffers from food allergies, such as nut, egg, milk or wheat allergies. Food allergies are caused by chaotic functioning of the immune system, that overreacts to some types of foods. Common symptoms of food allergies include rashes, swelling, vomiting, and wheezing.

For the study we’re discussing today, the team looked at data collected from 19 trials of fish oil supplements taken during pregnancy, involving a total of 15,000 participants. They report that the reduction in allergy risk equated to 31 fewer cases of egg allergy per 1,000 children. Afterward, they also analyzed the effect of probiotic supplements taken during pregnancy and discovered a 22% reduction in the risk of eczema development in children up to the age of three.

“Our research suggests probiotic and fish oil supplements may reduce a child’s risk of developing an allergic condition, and these findings need to be considered when guidelines for pregnant women are updated,” says Dr. Robert Boyle, lead author of the research.

The NHS advises that it’s better to eat fish than take fish oil supplements, fish being an excellent source of nutrients that are good for pregnant women‘s health and for their unborn baby’s development. The main reason for this is that eating liver and liver products such as liver pâté, liver sausage or fish liver oil supplements such as cod liver oil may contain too much vitamin A, and that can harm unborn babies. The NHS also recommends that tuna and oily fish consumption should be limited, while some types of fish should be avoided completely, such as shark. Also, don’t eat raw shellfish when pregnant, as it can cause food poisoning.

Avoiding foods such as nuts, dairy, and eggs during pregnancy made no difference to a child’s allergy risk. Also, fruit, vegetables, and vitamins seemed to have no repercussion on allergy risk either, the study published in the journal PLOS Medicine showed.